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Table 1.
Basic values of the physical and geometrical parameters adopted in the model.
| Parameter | Symbol | Basic value | Units |
|---|---|---|---|
| Sun’s galactic radius | R⊙ | 8.0 | kpc |
| LSR velocity | V0 | 230 | km s−1 |
| Spiral arms | |||
| Number of arms | m | 4 | – |
| Spiral pattern speed | Ωsp | 28.5 | km s−1 kpc−1 |
| Pitch angle | i | −14° | – |
| Arm width | σ sin i | 1.94 | kpc |
| Scale length |
|
4.0 | kpc |
| Spiral amplitude | ζ0 | 200.0 | km2 s−2 kpc−1 |
| Reference radius | Ri | 8.0 | kpc |
| Central bar | |||
| Bar’s mass | Mbar | 1 × 109 | M⊙ |
| Bar’s radius | Rbar | 2.9 | kpc |
| Equatorial flattening | fbar | 0.7 | – |
| Bar’s initial phase |
|
67.°5 | – |
| Bar’s pattern speed | Ωbar | 28.5 | km s−1 kpc−1 |
| Central bulge | |||
| Bulge’s mass | Mbulge | 1 × 1010 | M⊙ |
| Bulge’s radius | Rbulge | 1.0 | kpc |
| Polar flattening | fbulge | 0.2 | – |
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